make the corona act like a flare

1 files changed, 38 insertions, 31 deletions

diff --git a/src/render/draw.cc b/src/render/draw.cc
index 96bc632..2975ecb 100644
--- a/src/render/draw.cc
+++ b/src/render/draw.cc
@@ -303,40 +303,47 @@ void draw_globe(core::EntityGlobe *globe)
 	gl::translate(location);
 
 	if(flag_is_set(globe->flags(), core::Entity::Bright)) {
+
+		math::Vector3f v = globe->location() - Camera::eye();
+		v.normalize();
+		float a = dotproduct(v, Camera::axis().forward());
+		if (a > 0.1f) {
+			// FIXME a corona is actually just a giant flare		
+			if (!globe->render_texture) {
+				gl::enable(GL_TEXTURE_2D);
+			}		
+			Textures::bind("bitmaps/fx/corona");
 		
-		if (!globe->render_texture) {
-			gl::enable(GL_TEXTURE_2D);
-		}		
-		Textures::bind("bitmaps/fx/corona");
+			if (globe->state()->distance() <= farplane) {
+				gl::depthmask(GL_FALSE);
+			}
+			math::Color color(globe->color());
+			color.a = a - 0.1f;
 	
-		if (globe->state()->distance() <= farplane) {
-			gl::depthmask(GL_FALSE);
-		}
-		gl::color(globe->color());
-		globe->color().a = 1.0f;
-		gl::enable(GL_BLEND);	
-		
-		gl::begin(gl::Quads);
-		glTexCoord2f(0,1);
-		gl::vertex((Camera::axis().up() - Camera::axis().left()) * radius * 2.0f);
-		glTexCoord2f(0,0);
-		gl::vertex((Camera::axis().up() + Camera::axis().left()) * radius * 2.0f);
-		glTexCoord2f(1,0);
-		gl::vertex((Camera::axis().up() * -1 + Camera::axis().left()) * radius * 2.0f);
-		glTexCoord2f(1,1);
-		gl::vertex((Camera::axis().up() * -1 - Camera::axis().left()) * radius * 2.0f);
-		gl::end();
-
-		Stats::quads++;
-
-		gl::disable(GL_BLEND);
-		if (globe->state()->distance() <= farplane) {
-			gl::depthmask(GL_TRUE);
-		}
-		if (!globe->render_texture) {
-			gl::disable(GL_TEXTURE_2D);
+			gl::color(color);
+			gl::enable(GL_BLEND);	
+			
+			gl::begin(gl::Quads);
+			glTexCoord2f(0,1);
+			gl::vertex((Camera::axis().up() - Camera::axis().left()) * radius * 2.0f);
+			glTexCoord2f(0,0);
+			gl::vertex((Camera::axis().up() + Camera::axis().left()) * radius * 2.0f);
+			glTexCoord2f(1,0);
+			gl::vertex((Camera::axis().up() * -1 + Camera::axis().left()) * radius * 2.0f);
+			glTexCoord2f(1,1);
+			gl::vertex((Camera::axis().up() * -1 - Camera::axis().left()) * radius * 2.0f);
+			gl::end();
+	
+			Stats::quads++;
+	
+			gl::disable(GL_BLEND);
+			if (globe->state()->distance() <= farplane) {
+				gl::depthmask(GL_TRUE);
+			}
+			if (!globe->render_texture) {
+				gl::disable(GL_TEXTURE_2D);
+			}
 		}
-
 		radius *= 0.5f;
 	}